JPH10290240A - Data transmitter - Google Patents
Data transmitterInfo
- Publication number
- JPH10290240A JPH10290240A JP11174097A JP11174097A JPH10290240A JP H10290240 A JPH10290240 A JP H10290240A JP 11174097 A JP11174097 A JP 11174097A JP 11174097 A JP11174097 A JP 11174097A JP H10290240 A JPH10290240 A JP H10290240A
- Authority
- JP
- Japan
- Prior art keywords
- bus
- data
- transmission
- data processing
- termination resistor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000005540 biological transmission Effects 0.000 claims abstract description 59
- 230000005856 abnormality Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
Landscapes
- Small-Scale Networks (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、デ−タ処理装置を
伝送路に接続してデータの送受信およびその処理を行う
データ伝送装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transmission apparatus for transmitting and receiving data and processing the data by connecting a data processing apparatus to a transmission line.
【０００２】[0002]
【従来の技術】一般に、伝送系においては、マスタ局で
あるデ−タ処理装置と、スレ−ブ局である複数のデータ
処理装置とが、共通の伝送路に接続されており、この伝
送路を介して、相互にデ−タの送受信が行われる。この
場合、伝送路において電気的反射を防止するため、伝送
路の特性インピ−ダンスと等しいバス終端用抵抗を、マ
スタ局であるデ−タ処理装置と、スレ−ブ局であるデ−
タ処理装置のうち、伝送路の終端部にあたるデ−タ処理
装置の伝送デ−タ送受信部とに取り付ける必要がある。2. Description of the Related Art Generally, in a transmission system, a data processing device as a master station and a plurality of data processing devices as slave stations are connected to a common transmission line. , Data is mutually transmitted and received. In this case, in order to prevent electrical reflection in the transmission line, a bus terminating resistor equal to the characteristic impedance of the transmission line is provided with a data processing device as a master station and a data processing device as a slave station.
It must be attached to the transmission data transmission / reception unit of the data processing device, which is the terminal of the transmission path, of the data processing device.
【０００３】かかる伝送系においては、従来、スレ−ブ
局であるデータ処理装置を増設した場合、あるいはバス
終端用抵抗の実装してあるデ−タ処理装置に異常が発生
した場合には、バス終端用抵抗の取り外しを行い、別の
スレ−ブ局であるデ−タ処理装置にバス終端用抵抗を取
り付ける必要がある。このバス終端用抵抗の取り外しあ
るいは取り付け作業は、従来、手作業で行っている。In such a transmission system, conventionally, when a data processing device, which is a slave station, is added, or when an error occurs in the data processing device on which a bus terminating resistor is mounted, a bus is required. It is necessary to remove the terminating resistor and attach the bus terminating resistor to the data processing device which is another slave station. The removal or installation of the bus terminating resistor has conventionally been performed manually.
【０００４】[0004]
【発明が解決しようとする課題】上記従来の方法におい
ては、スレ−ブ局である伝送処理装置を伝送路の終端部
に増設した場合には、バス終端用抵抗が実装されている
スレ−ブ局の運転を停止してバス終端用抵抗を取り外
し、増設するスレ−ブ局にバス終端用抵抗を取り付ける
必要がある。In the above-mentioned conventional method, when a transmission processing device, which is a slave station, is added to the end of a transmission line, a slave having a bus terminating resistor mounted thereon. It is necessary to stop the operation of the station, remove the bus terminating resistor, and attach the bus terminating resistor to the slave station to be added.
【０００５】また、スレ−ブ局であるデ−タ処理装置に
異常が発生した場合には、異常モ−ドによっては、伝送
路全体に異常が波及して、正常な他のデ−タ処理装置が
デ−タ伝送できなくなるという場合も生じるので、スレ
−ブ局を伝送路から切り離す必要がある。この場合、異
常が発生したデ−タ処理装置が伝送路の終端部であっ
て、バス終端用抵抗が取り付けてある場合には、あらた
に伝送路の終端部となった他の正常なスレ−ブ局である
デ−タ処理装置の運転を停止して、バス終端用抵抗を取
り付ける必要がある。さらに、上記バス終端用抵抗の取
り外しあるいは取り付けは手作業によるため、復旧作業
に時間がかかる。If an abnormality occurs in a data processing device as a slave station, an abnormality spreads to the entire transmission line depending on the abnormality mode, and other normal data processing is performed. In some cases, the device cannot transmit data, so it is necessary to disconnect the slave station from the transmission line. In this case, if the data processing device in which the abnormality has occurred is the terminal of the transmission line and a bus terminating resistor is attached, another normal thread that has newly become the terminal of the transmission line is used. It is necessary to stop the operation of the data processing device, which is a bus station, and attach a bus terminating resistor. Further, since the removal or attachment of the bus terminating resistor is performed manually, it takes a long time to perform a recovery operation.
【０００６】そこで本発明は、スレ−ブ局の増設あるい
はスレ−ブ局に異常が発生したときに、他の正常なスレ
−ブ局の運転を停止することなく、自動的にバス終端用
抵抗の取り付けあるいは取り外しを可能にすることがで
きるデ−タ伝送装置を提供することを目的とする。Therefore, according to the present invention, when a slave station is added or an abnormality occurs in a slave station, a bus terminating resistor is automatically provided without stopping operation of other normal slave stations. It is an object of the present invention to provide a data transmission device capable of attaching or detaching a data transmission device.
【０００７】[0007]
【課題を解決するための手段】本発明では、伝送路に接
続されたマスタ局であるデ−タ処理装置と、前記伝送路
に接続されたスレ−ブ局である複数のデ−タ処理装置と
を備え、これらデ−タ処理装置間でデ−タの送受信を行
うデ−タ伝送装置において、前記スレ−ブ局である複数
のデ−タ処理装置の各伝送デ−タ送受信部に、バス終端
用抵抗およびバス終端抵抗接続用接点を直列にそれぞれ
接続するとともに、前記マスタ局であるデータ処理装置
からの指令により、前記バス終端抵抗接続用接点を開閉
して、前記バス終端用抵抗を前記伝送路に接続あるいは
切り離しするようにする。According to the present invention, a data processing device as a master station connected to a transmission line and a plurality of data processing devices as slave stations connected to the transmission line are provided. In the data transmission apparatus for transmitting and receiving data between these data processing apparatuses, each of the transmission data transmission and reception sections of the plurality of data processing apparatuses as the slave stations includes: A bus terminating resistor and a bus terminating resistor connection contact are connected in series, respectively, and the bus terminating resistor connection contact is opened and closed by a command from the data processing device, which is the master station, so that the bus terminating resistor is connected. The transmission line is connected or disconnected.
【０００８】上記本発明のデ−タ伝送装置においては、
スレ−ブ局であるデータ処理装置のバス終端用抵抗をマ
スタ局の指令により、自動的に取り付けあるいは取り外
しができるので、スレ−ブ局の増設時あるいはスレ−ブ
局の異常発生時に速やかに復旧することができる。In the data transmission apparatus of the present invention,
The bus terminating resistor of the data processing device, which is a slave station, can be automatically attached or detached according to the command of the master station, so it can be quickly restored when a slave station is added or an abnormality occurs in the slave station. can do.
【０００９】[0009]
【発明の実施の形態】図１は、本発明のデ−タ伝送装置
の実施の形態の一例を示す構成図である。図において、
マスタ局であるデータ処理装置１は、伝送路であるバス
３に接続される。スレ−ブ局であるデ−タ処理装置２に
は、バス３に接続される伝送デ−タ送受信部５が設けら
れる。伝送デ−タ送受信部５には、デ−タ送受信の実行
および伝送デ−タ送受信部５の制御をする伝送処理部４
が接続される。FIG. 1 is a block diagram showing an embodiment of a data transmission apparatus according to the present invention. In the figure,
The data processing device 1 as a master station is connected to a bus 3 as a transmission path. The data processing device 2, which is a slave station, is provided with a transmission data transmission / reception unit 5 connected to the bus 3. The transmission data transmission / reception unit 5 includes a transmission processing unit 4 for executing data transmission / reception and controlling the transmission data transmission / reception unit 5.
Is connected.
【００１０】伝送デ−タ送受信部５には、バス終端用抵
抗８およびリレ−６のバス終端抵抗接続用接点７が直列
に接続され、マスタ局であるデ−タ処理装置１からのバ
ス終端抵抗接続指令に基づいて、伝送処理部４によって
リレ−６が制御され、バス終端抵抗接続用接点７は開閉
制御される。すなわち、バス終端抵抗接続用接点７は、
伝送処理部４からリレ−６へのリレ−駆動出力によって
閉路あるいは開路して、バス終端用抵抗８が伝送デ−タ
送受信部５に接続あるいは切り離しされる。なお、スレ
−ブ局であるデ−タ処理装置２はバス３に複数接続され
ており、これらのデ−タ処理装置（図示せず）もデ−タ
処理装置２と全く同様に構成される。A bus termination resistor 8 and a bus termination resistor connection contact 7 of a relay 6 are connected in series to the transmission data transmission / reception section 5, and a bus termination from the data processing device 1 which is a master station. The relay 6 is controlled by the transmission processing unit 4 based on the resistance connection command, and the opening and closing of the bus termination resistance connection contact 7 is controlled. That is, the bus termination resistor connection contact 7 is
The circuit is closed or opened by the relay drive output from the transmission processing unit 4 to the relay 6, and the bus terminating resistor 8 is connected to or disconnected from the transmission data transmitting and receiving unit 5. A plurality of data processing devices 2, which are slave stations, are connected to the bus 3, and these data processing devices (not shown) are configured in exactly the same manner as the data processing device 2. .
【００１１】次に、上記デ−タ伝送装置の動作を説明す
る。通常時は、バス３に接続されている複数のスレ−ブ
局のうち、末端に接続しているスレ−ブ局が、マスタ局
からのバス終端抵抗接続指令を受信して、伝送処理部４
からリレ−６への駆動出力により、バス終端抵抗接続用
接点７は閉路状態にあり、バス終端用抵抗８が接続され
ている。Next, the operation of the data transmission apparatus will be described. Normally, among the plurality of slave stations connected to the bus 3, the slave station connected to the terminal receives the bus terminating resistor connection command from the master station and transmits the signal to the transmission processing unit 4.
In response to the drive output from the relay 6 to the relay 6, the bus termination resistor connection contact 7 is in a closed state, and the bus termination resistor 8 is connected.
【００１２】スレ−ブ局を末端に増設した場合、増設前
にバス終端用抵抗８が接続されていたスレ−ブ局に対し
て、マスタ局からバス終端抵抗接続用接点７を開路させ
るバス終端抵抗切離指令を送信する。スレ−ブ局の伝送
制御部４は、その指令に基づいてリレ−６への駆動出力
を制御し、バス終端抵抗接続用接点７は開路状態とな
り、バス終端用抵抗８は伝送デ−タ送受信部５から切り
離される。次に、マスタ局は増設したスレ−ブ局に対し
て、バス終端抵抗接続用接点７を閉路させるバス終端抵
抗接続指令を送信する。スレ−ブ局の伝送制御部４はそ
の指令に基づいてリレ−６への駆動出力を制御し、バス
終端抵抗接続用接点７は閉路状態となり、バス終端用抵
抗８は伝送デ−タ送受信部５に接続される。When a slave station is added at the end, a bus terminator that opens a bus terminating resistor connection contact 7 from the master station to the slave station to which the bus terminating resistor 8 was connected before the extension. Send a resistance disconnection command. The transmission control unit 4 of the slave station controls the drive output to the relay 6 based on the command, the contact 7 for connecting the bus terminating resistor is opened, and the bus terminating resistor 8 transmits and receives the transmission data. It is separated from the unit 5. Next, the master station transmits a bus termination resistor connection command to close the bus termination resistor connection contact 7 to the added slave station. The transmission control unit 4 of the slave station controls the drive output to the relay 6 based on the command, the contact 7 for connecting the bus terminating resistor is closed, and the resistor 8 for bus terminating is the transmission data transmitting / receiving unit. 5 is connected.
【００１３】[0013]
【発明の効果】以上説明したように、本発明によればス
レ−ブ局であるデ−タ処理装置のバス終端用抵抗の取り
付けあるいは取り外しが、運転を停止することなく、自
動的に可能になり、スレ−ブ局の増設時あるいは故障時
の復旧時間が短くなり、システムとしての高信頼化が可
能となる。As described above, according to the present invention, it is possible to automatically attach or remove the bus terminating resistor of the data processing device as the slave station without stopping the operation. As a result, the recovery time when a slave station is added or when a failure occurs is shortened, and the reliability of the system can be increased.
【図１】本発明の実施の形態の一例を示す構成図であ
る。FIG. 1 is a configuration diagram illustrating an example of an embodiment of the present invention.
１ デ−タ処理装置（マスタ局） ２ デ−タ処理装置（スレ−ブ局） ３ バス ４ 伝送処理部 ５ 伝送デ−タ送受信部 ６ リレ− ７ バス終端抵抗接続用接点 ８ バス終端用抵抗 Reference Signs List 1 data processing device (master station) 2 data processing device (slave station) 3 bus 4 transmission processing unit 5 transmission data transmission / reception unit 6 relay 7 bus termination resistor connection contact 8 bus termination resistor
Claims (1)
処理装置と、前記伝送路に接続されたスレ−ブ局である
複数のデ−タ処理装置とを備え、これらデ−タ処理装置
間でデ−タの送受信を行うデ−タ伝送装置において、 前記スレ−ブ局である複数のデ−タ処理装置の各伝送デ
−タ送受信部に、バス終端用抵抗およびバス終端抵抗接
続用接点を直列にそれぞれ接続するとともに、 前記マスタ局であるデータ処理装置からの指令により、
前記バス終端抵抗接続用接点を開閉して、前記バス終端
用抵抗を前記伝送路に接続あるいは切り離しするように
した、 ことを特徴とするデ−タ伝送装置。1. A data processing device which is a master station connected to a transmission line, and a plurality of data processing devices which are slave stations connected to the transmission line. In a data transmission device for transmitting and receiving data between processing devices, a bus termination resistor and a bus termination resistor are provided in each transmission data transmission and reception unit of the plurality of data processing devices as the slave stations. While connecting the connection contacts in series, according to a command from the data processing device as the master station,
The data transmission device, wherein the bus termination resistor connection contact is opened and closed to connect or disconnect the bus termination resistor to or from the transmission line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11174097A JPH10290240A (en) | 1997-04-15 | 1997-04-15 | Data transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11174097A JPH10290240A (en) | 1997-04-15 | 1997-04-15 | Data transmitter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10290240A true JPH10290240A (en) | 1998-10-27 |
Family
ID=14568993
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11174097A Pending JPH10290240A (en) | 1997-04-15 | 1997-04-15 | Data transmitter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10290240A (en) |
-
1997
- 1997-04-15 JP JP11174097A patent/JPH10290240A/en active Pending
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